Ocean coring:
is the best technique for sampling the ocean floor
uses high energy pulses to penetrate the bottom layers of rock
is used to study the effects of turbidity currents
or
all of the above?

option A, is the best technique for sampling the ocean floor

Explanation:

Ocean coring is a process in which sample of sea floor sediment is taken and studied to understand its composition. it is a common practice during the petroleum production from sea floor and hence is known as ocean sediment coring.

Usually a cylindrical sample is extracted beneath the sea floor by dropping a cylinder through the water. The sedimentary sample collected show the deposition of sediment (variation) with due course of time.

hence , option A is correct

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: